Megger's DLROH200 Micro-ohmmeter is capable of carrying out tests at currents up to 220 A
Megger's handheld DLROH200 Micro-ohmmeter weighs 1 kg and is capable of carrying out tests at currents up to 220 A. The instrument operates from rechargeable batteries that give over 2,000 measurements per charge. A wireless Bluetooth headset is also supplied as standard, and provides an audible pass/fail signal against user adjustable limits as tests are performed.
The DLROH200 supports DualGround testing for circuit breakers, which allows both sides of the circuit breaker to be earthed while the test is performed.
Megger’s DLROH200 high-current Micro-ohmmeter uses ultra capacitor technology. In a circuit, a capacitor with a value of hundreds of farads is charged from the battery, and then discharged into the circuit under test. Voltage and current in the test circuit are monitored continuously during the discharge, and an average value of resistance is displayed.
Depending on the resistance of the test circuits, a minimum test current of 100 A can be achieved for three seconds, with higher currents up to 220 A for shorter periods.
The DLROH200 is autoranging and measures resistance from 1 µΩ to 1 Ω. Results are shown on an LCD display that incorporates an analogue arc to show the start of charge of the ultra capacitor. Provision is made for internal storage of up to 190 test results, which can subsequently be downloaded via a wireless Bluetooth connection.
A copy of Megger’s PowerDB Lite software package is supplied with every DLROH200 Micro-ohmmeter. The software is designed for storing, analyzing and archiving test results and supports reporting in a range of industry-standard formats. It is also compatible with the full version of PowerDB.